Dalam perencanaan kawasan, ruang mati kerap muncul akibat kurangnya perhatian terhadap konektivitas antar elemen spasial. Di institusi pendidikan besar seperti Universitas Pelita Harapan (UPH) Karawaci, area seperti lorong sempit dan lahan kosong sering terabaikan, berdampak pada penurunan kualitas ruang, isu kebersihan, risiko keselamatan, dan lemahnya keterhubungan antar area kampus. Penelitian ini mengeksplorasi transformasi ruang mati di lingkungan UPH dengan pendekatan teknologi Mixed Reality, yang memungkinkan integrasi elemen virtual ke dalam ruang fisik tanpa memerlukan perubahan fisik. Berbeda dari Virtual Reality dan Augmented Reality, Mixed Reality menggabungkan elemen digital dan nyata secara langsung, menciptakan interaksi ruang yang lebih dinamis dan imersif. Teknologi ini berpotensi mengoptimalkan fungsi ruang mati menjadi area yang aktif, menarik, dan produktif. Dua lokasi intervensi utama adalah koridor antara Gedung B dan HOPE sebagai jalur evakuasi darurat, serta area taman hijau bekas proyek menara yang dibatalkan dan pernah menjadi kolam alami dimasa lalu. Metodologi penelitian bersifat kualitatif, meliputi: (1) studi literatur tentang ruang mati dan potensi teknologi Mixed Reality; (2) survei dan analisis lokasi untuk identifikasi permasalahan spasial dan peluang intervensi; (3) Eksplorasi desain prototyping dengan penekanan pada elemen alam, air, dan digital; dan (4) user testing melalui simulasi interaktif untuk mengevaluasi respons pengguna. Strategi desain difokuskan pada penempatan objek virtual di sekitar pengguna serta integrasi elemen atmosferik seperti alam, air, dan komponen digital untuk meningkatkan kualitas serta keterhubungan ruang. Dengan demikian, desain ruang MR diharapkan mentrasnformasi ruang-ruang mati menjadi ruang yang aktif dan terintegrasi secara holistik dalam konteks kampus. Hasil penelitian ini dapat memberikan kontribusi inovatif dalam bidang arsitektur, teknologi digital, dan pendidikan, dengan menawarkan pendekatan desain adaptif berbasis MR yang dapat meningkatkan kualitas ruang serta pengalaman pengguna di lingkungan terbangun. / In large-scale campus planning, dead spaces often emerge due to a lack of attention to spatial connectivity. At major educational institutions such as Pelita Harapan University (UPH) in Karawaci, areas like narrow corridors and unused land are frequently overlooked, resulting in decreased spatial quality, cleanliness issues, safety risks, and weak inter-area integration. This study explores the transformation of dead spaces within the UPH environment through the use of Mixed Reality (MR) technology, which enables the integration of virtual elements into physical spaces without requiring physical alterations. Unlike Virtual Reality and Augmented Reality, Mixed Reality merges digital and real-world elements in real time, creating more dynamic and immersive spatial interactions. This technology has the potential to optimize dead spaces into active, engaging, and productive areas. Two primary intervention sites are the corridor between Building B and the HOPE building, which functions as an emergency exit path, and a green garden area that was once a canceled tower project and previously a natural pond. The research employs a qualitative methodology, including: (1) a literature review on dead spaces and the potential of Mixed Reality technology; (2) site surveys and spatial analysis to identify spatial issues and intervention opportunities; (3) design prototyping exploration with emphasis on natural elements, water, and digital components; and (4) user testing through interactive simulations to evaluate user responses. The design strategy focuses on the placement of virtual objects around users and the integration of atmospheric elements such as nature, water, and digital features to enhance space quality and connectivity. Through this approach, MR space design aims to transform dead spaces into active and holistically integrated areas within the campus context. The outcomes of this study offer innovative contributions in architecture, digital technology, and education by proposing an adaptive MR-based design approach that enhances spatial quality and user experience in the built environment.